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Acquisition Acquisition, Textuals (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Dec. 23, 2013
Oct. 15, 2013
Jun. 03, 2011
Acquisitions [Abstract]              
Acquisitions, net of cash acquired $ 41,258 $ 15,336 $ 1,057,122        
Business Acquisition, Cost of Acquired Entity, Purchase Price Per Share         $ 13.25    
Business Combination, Consideration Transferred $ 1,500,000            
Business Combination, Debt Assumed         $ 331,500    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   11,400          
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   800          
Business Acquisition, Pro Forma Revenue   2,919,278          
Business Acquisition, Pro Forma Net Income (Loss)   $ 203,916          
Business Acquisition, Percentage of Voting Interests Acquired 24.40%     10.00%   20.00% 70.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage           90.00%